I think he's asking because the Electristar has two Deans connectors meant to hook up two 2-cell LiPo packs in series. Sounds like he wants to use a single 4-cell LiPo. If this is the case, then he'd have to buy another Deans connector and solder a short across it, to short out one of the two connectors in the plane, and then connect his 4-cell Lipo pack to the remaining connector. Just make sure that the 4-cell LiPo can source enough current for the Electristar. The recommended 2-cell LiPos put can put out 64A continuous, so shoot for that.